Is it something like two frequencies together produce frequencies which are both the sum and the difference between the two inputs?  And they go through a low pass filter to get the final tone? Like tuning a guitar the closer you get to tuning two strings the faster the beat gets?  Or is that how it might be done now?



-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of David Van Horn
Sent: 30. marraskuuta 2005 16:35
To: Microcontroller discussion list - Public.
Subject: RE: [OT] Theremins


The pitch side though, is where the "magic" happens.  There is a tuned
circuit on the "antenna" which is hard to explain in simple terms. It's
SRF is VERY close to the operating frequency, which amplifies and
linearizes the pitch scale, but only if properly tuned.  It's far more
complicated than just a body capacitance tuned VCO.



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